Fixes PR43181. This option was recently added to GNU objcopy (binutils
PR24942).
`llvm-objcopy -I binary -O elf64-x86-64 --set-section-alignment .data=8` can set the alignment of .data.
Reviewed By: grimar, jhenderson, rupprecht
Differential Revision: https://reviews.llvm.org/D67656
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@373461 91177308-0d34-0410-b5e6-96231b3b80d8